Android使用View Animation实现动画加载界面

package com.example.animationloading;  import java.util.Timer; import java.util.TimerTask;  import android.annotation.SuppressLint; import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView;  /**  * * @ClassName: com.example.animationloading.LoadingDialog * @Description: 动画加载Dialog * @author zhaokaiqiang * @date 2014-10-27 下午4:42:52 *  */ public class LoadingDialog extends Dialog {   protected static final String TAG = "LoadingDialog";  // 动画间隔  private static final int DURATION = 800;  // 前景图片  private ImageView img_front;  // 定时器，用来不断的播放动画  private Timer animationTimer;  // 旋转动画  private RotateAnimation animationL2R;   @SuppressLint("HandlerLeak")  private Handler handler = new Handler() {    public void handleMessage(Message msg) {    img_front.setAnimation(animationL2R);    animationL2R.start();   };   };   public LoadingDialog(Context context) {   super(context, R.style.dialog);  }   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.dialog_loading);    img_front = (ImageView) findViewById(R.id.img_front);   animationTimer = new Timer();    // 从左到右的旋转动画，设置旋转角度和旋转中心   animationL2R = new RotateAnimation(0f, -90f,     Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,     0.5f);   // 设置动画的运行时长   animationL2R.setDuration(DURATION);   // 动画运行结束之后，保存结束之后的状态   animationL2R.setFillAfter(true);   // 设置重复的次数   animationL2R.setRepeatCount(1);   //设置重复模式为逆运动   animationL2R.setRepeatMode(Animation.REVERSE);   // 执行间隔任务，开始间隔是0，每隔DURATION * 2执行一次   animationTimer.schedule(new TimerTask() {     @Override    public void run() {     handler.sendEmptyMessage(1);    }   }, 0, DURATION * 2);   }   @Override  protected void onStop() {   super.onStop();   animationTimer.cancel();  }  } 

<?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android"  android:duration="800"  android:fillAfter="true"  android:fromDegrees="0"  android:pivotX="50%"  android:pivotY="50%"  android:repeatCount="1"  android:repeatMode="reverse"  android:toDegrees="-90" >  </rotate> 

package com.example.animationloading;  import java.util.Timer; import java.util.TimerTask;  import android.annotation.SuppressLint; import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.ImageView;  /**  *  * @ClassName: com.example.animationloading.LoadingDialog  * @Description: 动画加载Dialog  * @author zhaokaiqiang  * @date 2014-10-27 下午4:42:52  *  */ public class LoadingDialog extends Dialog {   protected static final String TAG = "LoadingDialog";  // 动画间隔  private static final int DURATION = 800;  // 前景图片  private ImageView img_front;  // 定时器，用来不断的播放动画  private Timer animationTimer;   private Animation animation;   private Context context;   @SuppressLint("HandlerLeak")  private Handler handler = new Handler() {    public void handleMessage(Message msg) {    img_front.setAnimation(animation);    animation.start();   };   };   public LoadingDialog(Context context) {   super(context, R.style.dialog);   this.context = context;  }   @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.dialog_loading);    img_front = (ImageView) findViewById(R.id.img_front);   animationTimer = new Timer();    animation = AnimationUtils.loadAnimation(context,     R.anim.anim_load_dialog);      // 执行间隔任务，开始间隔是0，每隔DURATION * 2执行一次   animationTimer.schedule(new TimerTask() {     @Override    public void run() {     handler.sendEmptyMessage(1);    }   }, 0, DURATION * 2);   }   @Override  protected void onStop() {   super.onStop();   animationTimer.cancel();  }  } 

<style name="dialog" parent="android:style/Theme.Dialog">    <!-- 背景颜色及透明程度 -->   <item name="android:windowBackground">@android:color/transparent</item>   <item name="android:windowFrame">@null</item>   <item name="android:windowNoTitle">true</item>   <!-- 是否浮现在activity之上 -->   <item name="android:windowIsFloating">true</item>   <item name="android:windowContentOverlay">@null</item>  </style>